Electrical resistance.



J. F MGELEOY. ELECTRICAL RESISTANCE. .APPLIOATION FILED MAY18, 1910.

Patentbd Jan; 24, 1911.

\VITNESSES: INVENTOR 5 567. 4% J m4 (QT/4 235w? 5144' Y ATTE UNITED STATES PATENT OFFICE.

nuns 1*. monitor, or aL B A'nY, new YQBK, ASSIGN'OR T consomnmsn can nna'rme consent, is CORPORATION or WEST VIRGINIA.

' fl'nwdrmcnt assistance. 982,735, Specification oi LettersI'atcnt. Patented JanQZL, 1911. a ncaam mm m 18, 1910. Serial No. 562,008. e .To all whom it m con carnr wind'the cord with its si'irrounding wire i to the following same and is particularly designed for resistthe exterior 0 a suitable support as a cylindrical core of tire and water proof insulating material like porcelain, aspiral groove somewhat larger than'the diameter of the Be it known that I, Jet/ins F. Moljliinor, a citizen of the UnitedStates, residing at Albany, county of Albany, and State of,

New York, have invented certain new an useful Improvements in Electrical Resist- "cord being formed thereon for the reception ances, the following being a full, clear, and of the cord. Next, the supporting core, 'to exact disclosure of he. one form. of my ingether w th-the wire-wound cord thereon, is I vention which I at present deempreferable. coated with liquid insulating compound an For a detailed description-of the present baked until it becomes thoroughly and permanently hard. Referring to A represents ,t

form of n y invention, reference may be had specification and to the accompanying drawing forming a partthereof; the sai drawing being'a longitndinalsectional viewof a resistance embodying .the said inyention. i

My invention relates ances and the mode of the accompanying drawing, e asbestos cord aforesaid on which the line -resistance wire a is woun The wire-wound cord'is shown. as mounted on a porcelain core Bof cylindri'c 1 form on theouter surface of which a spiral groove has beenformec The ends of the cord are secured by a tie thread 0 at each end and the to electrical resistmanufacturing the ances composed of extremel line wire which terminals of' the wire are broil ht out is mechan cally weak and difficult to mamp-. through two holes-in an msulatmg; disk D ulate and wh ch' n the completed resistance a plied to one .en of thecore; A similar requires to be exposed sufficiently. to dlSSlr dlskf'E isapplied to the opposite end of the pate'the heat'continually produced by the core and both disks securei n place by a to electric current therein and which also rerod F extending through the core from end tcrial such as asbcstoslfor example,% of an it is dry and hard yet st'lltlexible. I then to end and secured by a nut Metallic end pieces H are secured in place outside of the insulating disks by the same rod l4 and, if desired, a tubular metallic casing in place between the two end plates ll. ll.

1 call pa rticulai' attention to the flexibility of the cord A by reason of, which it can be quires to be mounted and supported in ainaiiner consistent with its weak and slender character.

ln constructing my resistance, I first take a flexible 'cord of refractory insulating mainch in diameter) and use'it as a core upon which I wind the bare resistance wire. placed in any desired shape on a suita e have used for this purpose inichrome wire supportsuch as the porcelain core after as fine as .000 of an inc in diameter and, the wire has been wound thereon; tthe such wire is wound upon the asbestos cor same time the asbestosaftords a ead or about 4.8 turns to the inch. By this means yielding supportt'or the slender wire. The the wire, while still uncoated by insulating Surface of the asfestos is also moisture pro'o so that the wire may not become oxidized reason of moisture in the absorbent matcria ofthe cort Theinsulating material after it has been halted will still be of a sufiiciently ielding natngjre to allow for the expansion material, is the cord, and which itwill given an adequate is substantially in the position occupy with respect to' the cord in the completed resistance. This avoids any subsequent manipulation of the slender support by wne in an nnsupporte conditiom \Vhen and contraction of the wire under the extheroper length of cord has thus been covtreme range of temperature to which it is subjected in service. he wire is therefore so held by its insulating coating anddhe surface of the asbestos that it is not subjected toinechanical strain by its expansion an contract-ion. 1 he wire moreover remains I place it in an ere with wire, oven an expel the moisture therefrom by: heat and after the moisture is thus expelled, I dip the cord with the wire thereon, in asuitab e liquidinsulator which will at the-sametiine coat the wire and impregnate the surface of the absorbent asbestos cord to make it waterl'next return the .cord, with itssur bake it unti tion of the heatwhich is constantlyybeing accumulated by the passageuof electric carroiniding wire, to the oven an rent through it. hould a break occur in tlie'wire it can be readily located and re- J is 'llOld sufiicicntly exposed to admit-of thedissipapaired without removing the cord and wire from'the sup rt. Should it be desirable at any time to c ange thecoil, it can be readily stri ped from the cylindrical su port and -rep aced by a new one. Hereto ore resistances of this; kind have customarily been 'formed uponv rigid forms such as cast iron,

of my resistance has a comparativelysoft and -yielding su porting surface upon the asbestos core an a more complete'exposure for dissi ation of heat, while the wire can 1 be readi y re aired or a new wire readily substituted without a loss of the other portions of the apparatus. I have designed this device for electric heating as well as for. rheostatic use.

"' hat I claim' as new and desire to secure by Letters Patent is:

1. An electrical resistance comprising a fine .wire' combined with a flexible, moisture proof cord of refractory'insulating material fine wire. combined with a flexible cord of on Whichsaidwire is wou'nd'with successive turns separated by an air space, and an insulating support on-which is mounted the is'aidcord wit-h the wire thereon exposed to the air.

An electrical resistance comprising a rigid support combined witha fine wire wound on a comparatively soft cord of insulating material, and. the said cord mounted on'the rigid support with the fine wire thereon exposed to the air.

.3. An electrical resistance comprising a water roof asbestos on which said wire is woun with successive turns searatcd by an air space, and a-.viti'cous insu ating' support on which is mounted the saideord with .I -the wire thereon exposedto the air.

16th day of May, 1910.

Anelect'rical, resistance comprising a flexible moistureroof cord of refractory insulating inateria a fine wire wound thereon, thewire being coated and'the' cordbeing impregnated with an insulating substance, and a support to which'the wirewound cord Y is applied in an exposed condition.

5. The method of forming an electrical resistance coinprising, firstpwindinga fine wire on a flexible cord of refractory-ab. sorhent insulating material and expelling moisture therefrom and, second, coating the w re and impregnating the surface of said cord with a liquid insulator.

6. The method of forming an electrical.

resistance, comprising winding a'fine wire on a flexible cord of absorbent refractory insulating material, expelling: the moisture therefrom, coating thev wire and impregnating the surfaceiof said cord with a liquid insulatorandbaking"the cordand wire thus j i treated 1 .7. The method of forming. an electrical resistance comprising winding a fine wire on a flexible cordof absorbent refractoryinsulating material, coating the wire and lIIl." pregnatmg the surface-of the said cord with a liquid iusulatoqbakinglthe cord and wire thus treated and mounting them on the ex-' terior ofan insulating support.

8 The method of forming an electrical resistance comprising windingca fine wire.'

on a flexible c ordof refractory material, coating the wire andxwate'rproofing the said cord,mounting the wire-wound cord on its support, applying 'a liquid insulator to both the cord and its support andfinally baking the same.

. In witness whereof I have hereunto set my hand, before two subscribing. witnesses, this JAMES F. McIGLROY- 'Witnesses ERNEST D'. Jansen, ROBERT MCCOCIIRANE. 

